I'm not agreeing that Eth is a scam but to say that because it is 1) big and 2) still being worked on doesn't mean it isn't a scam. I mean look at Bernie Madoff. He was one of the most famous and 'successful' investors of his time and people thought that since he looked good and said he was making everyone money that he actually was. His investment funds were 1) big and 2) he was actively working on them, it was just that his work was to trick people into giving him money and then work to keep his scheme a secret.
I'm not saying this is the same but what I am saying is that looks can be deceiving. Just because something looks great and a lot of people say it is great doesn't actually make it great.